fix(#3683): wire gated learnings extraction into completion, align copy path (#3810)

* test(#3683): failing-first rows for learnings source resolution and wiring pins

* fix(#3683): wire gated learnings extraction into completion, align copy path

* test(#3683): register the learnings suite in the docs-guard lane, drop unverified markers

* fix(#3683): close review findings — per-item parsing, readdir guards, docs paths

* fix(#3683): route phase enumeration through the locator seam, fix assertion targets

* fix(#3683): merge execute-phase ack into the 3003 fragment, fix fidelity targets

* fix(#3663): replace the spent execute-phase ack entry with the 3683 re-arm

* chore(#3683): backfill changeset pr number

---------

Co-authored-by: sim <sim@local>

scripts/docs-guard-registry.cjs

@@ -161,6 +161,10 @@ const DOCS_GUARD_TESTS = {
   // fixture ADRs throughout) and separately reads docs/contributor-standards.md.
   'tests/adr-index-gate.test.cjs': ['docs/adr/', 'docs/contributor-standards.md'],
   'tests/agent-classification-parity.test.cjs': ['docs/AGENTS.md', 'docs/INVENTORY.md'],
+  // #3683: pins the learnings feature section's agreement with the canonical
+  // artifact registry (reads docs/FEATURES.md around the extract-learnings
+  // entry).
+  'tests/learnings.test.cjs': ['docs/FEATURES.md'],
   'tests/analyze-dependencies.test.cjs': ['docs/COMMANDS.md'],
   'tests/autonomous-converge.test.cjs': [
     'docs/COMMANDS.md',